bug#11860: 24.1; Arabic - Harakat (diacritics, short vowels) don't appear

[Eli Zaretskii]

> From: Steffan <smias@yandex.ru>
> Cc: jasonr@gnu.org,11860@debbugs.gnu.org,smias@yandex.ru,Eli Zaretskii 
> <eliz@gnu.org>
> Date: Wed, 22 Aug 2012 21:52:07 +0200
> 
>  After choosing the arabic-input-method:
> - By typing "h" (for "Alef" ا) then "U" (for "Ayin" ع ) you get the 2 
> characters correctly
> - But after typing "X" (for the "vowel" Sukun ْ) you get nothing. (In hebrew 
> you can see QUBBUTS (but also at the wrong position - by the FIRST 
> character.) [This is THE ONLY difference!] 
> - Move the cursor to the beginning of the line (Ctrl-a) you will see the 
> Sukun (the small circle). BUT on the Alef NOT on the Ayin.
> -- If you write then anything in the SAME line the Sukun disappears! And if 
> you change the "WINDOW" (Alt-Tab) and goes back to Emacs it disappears too. 
> - Move the cursor again to the beginning of the line (Ctrl-a) you will see 
> the Sukun (the small circle) again.
> -- If you type ENTER at the end of the line (Ctrl-e) you can write what you 
> want, you can always see the Sukun.

The latest trunk works correctly with this recipe: the Sukun is
positioned at the right place and does not disappear.